chore(kustomize): move image tag to kustomization.yaml

Signed-off-by: Michael Goodness <michael.goodness@mlb.com>

kustomize/external-dns-deployment.yaml

@@ -15,9 +15,9 @@ spec:
     spec:
       serviceAccountName: external-dns
       containers:
-      - name: external-dns
-        image: k8s.gcr.io/external-dns/external-dns:v0.7.3
-        args:
-        - --source=service
-        - --source=ingress
-        - --registry=txt
+        - name: external-dns
+          image: k8s.gcr.io/external-dns/external-dns
+          args:
+            - --source=service
+            - --source=ingress
+            - --registry=txt

kustomize/kustomization.yaml

@@ -1,5 +1,12 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+images:
+  - name: k8s.gcr.io/external-dns/external-dns
+    newTag: v0.7.3
+
 resources:
-- ./external-dns-deployment.yaml
-- ./external-dns-serviceaccount.yaml
-- ./external-dns-clusterrole.yaml
-- ./external-dns-clusterrolebinding.yaml
+  - ./external-dns-deployment.yaml
+  - ./external-dns-serviceaccount.yaml
+  - ./external-dns-clusterrole.yaml
+  - ./external-dns-clusterrolebinding.yaml